Cloud Spanner V1 API - Module Google::Cloud::Spanner::V1::RequestOptions::Priority (v1.17.1)

Reference documentation and code samples for the Cloud Spanner V1 API module Google::Cloud::Spanner::V1::RequestOptions::Priority.

The relative priority for requests. Note that priority isn't applicable for BeginTransaction.

The priority acts as a hint to the Cloud Spanner scheduler and doesn't guarantee priority or order of execution. For example:

  • Some parts of a write operation always execute at PRIORITY_HIGH, regardless of the specified priority. This can cause you to see an increase in high priority workload even when executing a low priority request. This can also potentially cause a priority inversion where a lower priority request is fulfilled ahead of a higher priority request.
  • If a transaction contains multiple operations with different priorities, Cloud Spanner doesn't guarantee to process the higher priority operations first. There might be other constraints to satisfy, such as the order of operations.

Constants

PRIORITY_UNSPECIFIED

value: 0
PRIORITY_UNSPECIFIED is equivalent to PRIORITY_HIGH.

PRIORITY_LOW

value: 1
This specifies that the request is low priority.

PRIORITY_MEDIUM

value: 2
This specifies that the request is medium priority.

PRIORITY_HIGH

value: 3
This specifies that the request is high priority.